Exporter fails if API returns null for any field #3
Description
Hey there, just wanted to raise this issue I have started seeing:
2025-07-04 22:44:16,583 DEBUG API response: 200; {
"api_version" : "V1.1.0-1.0.41",
"time_stamp" : 1751669056,
"data_time_stamp" : 1751669035,
"max_age" : 604800,
"firmware_default_version" : "7.02",
"fields" : ["sensor_index","last_seen","name","humidity","temperature","pressure","pm2.5","pm10.0","pm2.5_10minute"],
"data" : [
[119509,1751668989,"Nothern Meadows",null,null,null,7.0,7.9,6.6]
]
}
Traceback (most recent call last):
File "/app/purpleair_exporter.py", line 289, in <module>
main()
File "/app/purpleair_exporter.py", line 78, in main
collect_metrics(sensor_ids, api_key)
File "/app/purpleair_exporter.py", line 89, in collect_metrics
transform_sensor_data(parsed_data)
File "/app/purpleair_exporter.py", line 156, in transform_sensor_data
stat.labels(sensor_id = sensor_id, label = sensor_label).set(data[key])
File "/usr/local/lib/python3.11/site-packages/prometheus_client/metrics.py", line 396, in set
self._value.set(float(value))
^^^^^^^^^^^^
TypeError: float() argument must be a string or a real number, not 'NoneType'
Seems like three of the expected return fields are actually null and there isn't code to handle this.
I'd be happy to submit a PR to handle the null case, just wanted to check to see if this is something you still maintain before I do.